body {
  margin: 0;
  background: #f0f2f5;
}
.el-header {
  background-color: #409EFF;
  color: white;
  line-height: 60px;
}
.el-aside {
  background-color: #545c64;
  color: white;
}
.el-main {
  background-color: #f0f2f5;
  padding: 20px;
} 